1. The International System of Units (SI Units)
Also known as the metric system

2. Not based on any one particular number... CONFUSING!
U.S. Customary System
12 inches in 1 foot
3 feet in 1 yard
4 quarts in 1 gallon
Not based on any one particular number... CONFUSING!

3. The International System of Units
The United States is the only industrialized country that does not use SI units

4. The International System of Units
The entire metric system is based on units of 10

5. Base Units (copy the following chart)
Measurement
Base Unit
Abbreviation
Length
Meter m
Volume
Liter L
Mass
Gram g
Time
Second s
Temperature
Degrees Celsius
° C

6. Metric Prefixes Prefixes indicate which multiple of ten to us
kilo- (k)= 1,000 base units
hecto- (h)= 100 base units
deka- (dk)= 10 base units
Base unit (g, m, L, etc.)
deci- (d)= 1/10 base unit, so 1 base unit = 10 d__
centi- (c)= 1/100 base unit, so 1 base unit = 100 c___
milli- (m)= 1/1000 base unit, so 1 base unit = 1,000 m___

7. Large units of Length
1,000 meters = 1 kilometer (km)

8. Smaller units of Length
100 cm = 1 m
1,000 mm = 1 m
10 mm = 1 cm

9. *Centimeters, NOT inches!
Measuring length
Use a meter stick
Or a ruler
*Centimeters, NOT inches!

10. Mass
Mass is a measure of how much matter something contains

11. Units of Mass
1,000 grams = 1 kilogram

12. Smaller units of Mass
1,000 milligrams = 1 gram

13. Measuring Mass
Use a triple-beam balance scale

14. Start with the middle beam (100s), move to the back beam (10s), and last the front beam (1s). Add them all up

15. Volume
Volume is a measure of the amount of space a piece of matter takes up
Ex: Inflated balloon takes up more space than an empty balloon

16. Units of Volume
1,000 milliliters = 1 liter

17. Measuring Volume
Use a graduated cylinder

18. Using a graduated cylinder
Meniscus: the curve of the surface of the liquid
To find the volume of a liquid, read the mark that lines up with the bottom of the meniscus

19. Mini Quiz How many meters are in a kilometer? 10 100 1000
When measuring the volume of a liquid, you read the line that lines up with the _____ of the meniscus.
Bottom
Middle
Top

20. The Metric System Video
Brainpop:
icunits/

21. King Henry Doesn’t Usually Drink Chocolate Milk